package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面类，实现公共字段填充
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    //前置通知，在通知中进行公共字段赋值
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段填充。。。");


        //拦截到mapper方法上数据库的操作类型  方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获得签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得操作类型

        //获取当前方法的实体对象
        Object[] args = joinPoint.getArgs();//把实体对象放在第一位
        if (args==null || args.length==0){
            return;
        }
        Object entrys = args[0];//实体对象
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据不同的操作类型，去给实体赋值 用反射
        if (operationType==OperationType.INSERT){
            //为四个公共字段赋值  常量赋值
            try {
                Method setCreateTime = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射赋值
                setCreateTime.invoke(entrys,now);
                setCreateUser.invoke(entrys,currentId);
                setUpdateTime.invoke(entrys,now);
                setUpdateUser.invoke(entrys,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        } else if (operationType==OperationType.UPDATE) {
            //两个
            try {
                Method setUpdateTime = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entrys.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entrys,now);
                setUpdateUser.invoke(entrys,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }


    }

}
